Listed as UNESCO heritage, these medieval church ruins are symbol of the glorious history of the city.
Wikipedia (Swedish) http://sv.wikipedia.org/wiki/Sankta_Katarina_kyrkoruin
More information on Gotland.net http://www.gotland.net/plats/sta-karins-ruin
Address Stora Torget 2, 621 56 Visby, Sweden
Coordinates 57°38'25.495" N 18°17'44.369" E